1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Can someone help with this problem

  1. Jan 12, 2007 #1
    1. The problem statement, all variables and given/known data

    Find the derivitive of y = (e^cx)(c sin x – cos x)

    2. Relevant equations


    3. The attempt at a solution

    c(e^cx)(c sin x – cos x) + (c cos x + sin x)(e^cx)

    The answer is { (1+c^2)((e^cx)sin x)
  2. jcsd
  3. Jan 12, 2007 #2


    User Avatar
    Homework Helper

    You're doing fine, they are the same! Try to simplify :smile:
  4. Jan 12, 2007 #3
    it is right .... hey TD ..what he should simplify
  5. Jan 12, 2007 #4


    User Avatar
    Homework Helper

    If you look well, you see the terms in cos(x) are opposite, they cancel out.
  6. Jan 12, 2007 #5
    ah ok he did it .... i thought there is somethin' else i missed thanks for the reply
  7. Jan 12, 2007 #6
    Thanks TD i see how it works now :smile:
  8. Jan 12, 2007 #7


    User Avatar
    Homework Helper

    You're welcome!

    When you see that the given answer doesn't match your "longer" answer, always think of simplifying, it may just be correct after all :smile: !
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook